JP3769963B2 - 12 pulse power converter - Google Patents

12 pulse power converter Download PDF

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JP3769963B2
JP3769963B2 JP03382799A JP3382799A JP3769963B2 JP 3769963 B2 JP3769963 B2 JP 3769963B2 JP 03382799 A JP03382799 A JP 03382799A JP 3382799 A JP3382799 A JP 3382799A JP 3769963 B2 JP3769963 B2 JP 3769963B2
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reactor
phase
power converter
circuit
connection
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JP2000232786A (en
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昌人 望月
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Fuji Electric FA Components and Systems Co Ltd
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Fuji Electric FA Components and Systems Co Ltd
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Description

【０００１】
【発明の属する技術分野】
この発明は、３０度の位相差を有する２組の三相交流電源を別個に全波整流する２組の電力変換装置の出力を平衡させる１２パルス電力変換装置に関する。
【０００２】
【従来の技術】
図３は１２パルス電力変換装置の第１従来例を示した主回路接続図である。図３に図示の第１従来例回路において、三相交流電源１５に１２パルス接続用変圧器１を接続する。この１２パルス接続用変圧器１は一次巻線１Ａと２組の二次巻線，すなわちスター接続二次巻線１Ｂとデルタ接続二次巻線１Ｃとで構成しており、２組の二次巻線のうちの一方がスター接続であるならば他方はデルタ接続にする。
【０００３】
第１インバータ装置１２は、第１電力変換装置としての第１三相全波整流回路２と第１インバータ回路８と、これら両者の直流側同士を接続している直流中間回路に挿入されている第１直流リアクトル４と第１平滑コンデンサ６とで構成されており、この第１インバータ装置１２を１２パルス接続用変圧器１のスター接続二次巻線１Ｂに接続しており、この第１インバータ装置１２が所望の電圧と周波数の交流電力を第１交流負荷１０へ供給する。同様に第２インバータ装置１３も、第２電力変換装置としての第２三相全波整流回路３と第２インバータ回路９と、これら両者の直流側同士を接続している直流中間回路に挿入されている第２直流リアクトル５と第２平滑コンデンサ７とで構成されており、この第２インバータ装置１３を１２パルス接続用変圧器１のデルタ接続二次巻線１Ｃに接続して第２交流負荷１１へ所望の電圧と周波数の交流電力を供給する。
【０００４】
スター接続二次巻線１Ｂの三相交流出力とデルタ接続二次巻線１Ｃの三相交流出力との間には３０度の位相差があるから、それぞれの二次巻線１Ｂと１Ｃに別個の三相全波整流回路２，３を接続することにより、所謂１２パルス電力変換装置が形成され、三相交流電源１５へ流れる高調波電流が低減される効果を得ることができる。しかし、第１三相全波整流回路２と第２三相全波整流回路３が別個にそれぞれの負荷へ直流電力を供給する場合、通常は両三相全波整流回路２，３の出力は同じにはならないから、前述した高調波電流低減効果を期待することはできない。
【０００５】
第１三相全波整流回路２の直流出力側に第１直流リアクトル４と第１平滑コンデンサ６とを接続してこの直流出力を平滑にしており、第２三相全波整流回路３の直流出力側にも第２直流リアクトル５と第２平滑コンデンサ７とを接続してその直流出力を平滑しているが、これら平滑された両直流出力を、正極側接続線１６と負極側接続線１７とで並列に接続する。これにより、第１三相全波整流回路２の出力電流と第２三相全波整流回路３の出力電流は、第１交流負荷１０と第２交流負荷１１とへ電力を供給する場合でも平衡状態にある。
【０００６】
【発明が解決しようとする課題】
しかし実際には、１２パルス接続用変圧器１のスター接続二次巻線１Ｂの無負荷電圧とデルタ接続二次巻線１Ｃの無負荷電圧には僅かながら不平衡があるし、両二次巻線１Ｂ，１Ｃそれぞれの巻線インダクタンスも同じ値にはならないから、平滑された両三相全波整流回路２，３の直流出力を正極側接続線１６と負極側接続線１７で並列に接続しても、両者の直流電流に不平衡を生じることがある。ここで両インバータ装置１２，１３の直流中間回路に挿入されている第１直流リアクトル４と第２直流リアクトル５は、これら両インバータ装置１２，１３が単独の６パルス電力変換装置として（すなわち正極側接続線１６と負極側接続線１７とを取り除いた状態で）運転する場合に、それぞれの入力力率を改善するためのものである。それ故、第１直流リアクトル４は第１三相全波整流回路２の出力直流電流のみを一定に保つように動作し、第２直流リアクトル５は第２三相全波整流回路３の出力直流電流のみを一定に保つように動作しており、両三相全波整流回路２，３の出力直流電流を平衡させるバランサーとしての動作を期待することはできない。
【０００７】
そこでスター接続二次巻線１Ｂとデルタ接続二次巻線１Ｃの無負荷電圧のアンバランスや巻線インダクタンスのアンバランスを低減させるべく特殊構造の専用変圧器をわざわざ製作するのであるが、この製作に長期間を要すると共に価格が上昇する欠点がある。更に、前述のアンバランスを完全に零にすることは原理的に困難である。
【０００８】
図４は１２パルス電力変換装置の第２従来例を示した主回路接続図であって、単独負荷へ交流電力を供給する場合を示している。図４に図示の第２従来例回路において、１２パルス電力変換装置２０は、１２パルス接続用変圧器１のスター接続二次巻線１Ｂに接続した第１電力変換装置としての第１三相全波整流回路２，１２パルス接続用変圧器１のデルタ接続二次巻線１Ｃに接続した第２電力変換装置としての第２三相全波整流回路３，バランス用２巻線リアクトル２１，平滑コンデンサ２２，およびインバータ回路２３で構成していて、インバータ回路２３が出力する所望の電圧と周波数の交流電力で交流負荷２４を運転する。バランス用２巻線リアクトル２１は第１三相全波整流回路２の出力直流電流を流す一方のコイルと、第２三相全波整流回路３の出力直流電流を流す他方のコイルとを備えており、これら２つのコイルを共通の鉄心に巻く構造にしているので、両三相全波整流回路２と３の出力電流の不平衡を抑制することができる。しかしながら図４の従来例回路ではバランス用２巻線リアクトル２１を特別に製作しなければならないので、やはり装置が高価になることや、装置の納期が長くなるなどの不都合を有している。
【０００９】
そこでこの発明の目的は、１２パルス電力変換装置を構成する２つの三相全波整流回路の出力電流を、特別に製作する１２パルス接続用変圧器やバランス用２巻線リアクトルなどを使用せずに、簡単にバランスさせることにある。
【００１０】
【課題を解決するための手段】
前記の目的を達成するために、この発明の１２パルス電力変換装置は、
三相交流電源に接続して全波整流により直流を得る第１電力変換装置の直流出力側と、この三相交流電源と３０度の位相差を有する別の三相交流電源に接続して全波整流により直流を得る第２電力変換装置の直流出力側とを並列に接続し、この並列接続点と負荷との間に直流リアクトルと平滑コンデンサを挿入するものとする。
【００１１】
または、前記第１電力変換装置の直流出力側に第１直流リアクトルと第１平滑コンデンサを接続し、前記第２電力変換装置の直流出力側に第２直流リアクトルと第２平滑コンデンサを接続し、前記第１直流リアクトルの電源側と第２直流リアクトルの電源側とを共通に接続し、前記第１平滑コンデンサと第２平滑コンデンサとを並列接続したのちに負荷を接続するものとする。
【００１２】
【発明の実施の形態】
図１は本発明の第１実施例を表した主回路接続図であるが、この第１実施例回路に記載の１２パルス接続用変圧器１（一次巻線１Ａとスター接続二次巻線１Ｂとデルタ接続二次巻線１Ｃで構成），第１電力変換装置としての第１三相全波整流回路２，第２電力変換装置としての第２三相全波整流回路３，三相交流電源１５，平滑コンデンサ２２，インバータ回路２３，および交流負荷２４の名称・用途・機能は、図４で既述の第２従来例回路の場合と同じであるから、これらの説明は省略する。
【００１３】
図１の第１実施例回路における１２パルス電力変換装置３０は、スター接続二次巻線１Ｂに接続した第１三相全波整流回路２の直流出力側とデルタ接続二次巻線１Ｃに接続した第２三相全波整流回路３の直流出力側とを２本の並列接続線３２で並列に接続し、この並列接続点とインバータ回路２３の直流側との間に，平滑コンデンサ２２とバランス用直流リアクトル３１とが挿入された構成になっている。２本の並列接続線３２で両三相全波整流回路２と３の直流出力側を並列接続することにより、バランス用直流リアクトル３１は第１三相全波整流回路２の出力直流電流と第２三相全波整流回路３の出力直流電流とを一定に保つように動作する。すなわち図４の従来例回路で既述のバランス用２巻線リアクトル２１と同様の電流バランス作用が得られる。
【００１４】
図２は本発明の第２実施例を表した主回路接続図であるが、この第２実施例回路は、図３で既述の第１従来例回路に電源側接続線４１を付加しているのみであって、これ以外の各機器の名称・用途・機能はすべて図３の第１従来例回路と同じであるから、これらの説明は使用略する。
【００１５】
この第２実施例回路では、第１三相全波整流回路２の直流出力側と第２三相全波整流回路３の直流出力側とを共通にするために、両者を電源側接続線４１で接続する。これにより第１直流リアクトル４と第２直流リアクトル５とは両三相全波整流回路２と３が出力する直流電流を一定に保つように動作するから、図４に図示のバランス用２巻線リアクトル２１と同じ作用を発揮する。
【００１６】
この図２の第２実施例回路に図示の回路構成にすれば、第１三相全波整流回路２と第２三相全波整流回路３とを並列運転することにより、不平衡を生じること無しで両者に共通の負荷へ直流電力を供給することができるし、正極側接続線１６と負極側接続線１７および電源側接続線４１を取り除けば、第１三相全波整流回路２と第２三相全波整流回路３とを別個に運転して別々の負荷へ電力を供給することも可能である。
【００１７】
図５は図３の第１従来例回路に図示の１２パルス接続用変圧器の出力電流をシミュレーション計算により描いた電流波形図であるが、図３の第１従来例回路における１２パルス接続用変圧器１のスター接続二次巻線１Ｂに現れる無負荷電圧とデルタ接続二次巻線１Ｃに現れる無負荷電圧とに３ボルトの差があり、且つ両二次巻線のインダクタンスに１０％の差がある場合をシミュレーションの条件にして計算している。この電流波形図の縦軸は電流，横軸は時間を表しており、破線がスター接続二次巻線１Ｂの出力電流ＩB を、実線がデルタ接続二次巻線１Ｃの出力電流ＩC を、それぞれが示している。
【００１８】
図６は図２の第２実施例回路に図示の１２パルス接続用変圧器の出力電流をシミュレーション計算により描いた電流波形図であるが、このときのシミュレーション計算の条件は前述した図５の電流波形図の場合と同じである。この図６の電流波形図では、破線で図示したスター接続二次巻線１Ｂの出力電流ＩB と、実線で図示したデルタ接続二次巻線１Ｃの出力電流ＩC とは殆ど同じ（両電流のバランスの程度は実効値で９０％）であり、図５に図示の従来例回路での電流アンバランスが大きく改善されていることが分かる。
【００１９】
【発明の効果】
１２パルス電力変換装置は相互に３０度の位相差を設けた２組の三相交流に別個の三相全波整流器を接続した構成にするのであるが、３０度の位相差を有する２組の三相交流を得るために、スター接続二次巻線とデルタ接続二次巻線とを備えた１２パルス接続用変圧器を使用する。しかし１２パルス接続用変圧器が備える２つの二次巻線の無負荷電圧や２つの二次巻線のインピーダンス値を同じ値に揃えるのは、原理的に困難である。それ故従来は、この無負荷電圧のアンバランスや巻線インピーダンスのアンバランスが低減できるように特別に設計・製作した１２パルス接続用変圧器を使用したり、特別に設計・製作したバランス用２巻線リアクトルを使用して、両者の電流が不平衡になるのを抑制しなければならなかったので、装置全体のコストが上昇し、装置の製作に長時間を要する不具合があった。
【００２０】
これに対して本発明では、２つの二次巻線に別個に接続している三相全波整流器の直流出力側を並列接続したのちに、両三相全波整流器に共通のバランス用直流リアクトルと平滑コンデンサを接続する。または別個のバランス用直流リアクトルと平滑コンデンサを備えた２つの三相全波整流器の場合は、各三相全波整流器の出力側を共通にする接続と、２つの平滑コンデンサを並列にする接続とを施す。このようにすることにより、ほぼ完全に両者の電流バランスが得られる。すなわち数本の接続線を接続する作業を追加するのみで、特別な１２パルス接続用変圧器やバランス用２巻線リアクトルは不要であるから、装置のコスト上昇を抑制し、製作期間の長期化を回避できる効果が得られるし、装置全体が大形化するのを抑制できる効果も合わせて得られる。
【図面の簡単な説明】
【図１】本発明の第１実施例を表した主回路接続図
【図２】本発明の第２実施例を表した主回路接続図
【図３】１２パルス電力変換装置の第１従来例を示した主回路接続図
【図４】１２パルス電力変換装置の第２従来例を示した主回路接続図
【図５】図３の第１従来例回路に図示の１２パルス接続用変圧器の出力電流をシミュレーション計算により描いた電流波形図
【図６】図２の第２実施例回路に図示の１２パルス接続用変圧器の出力電流をシミュレーション計算により描いた電流波形図
【符号の説明】
１ １２パルス接続用変圧器
１Ａ 一次巻線
１Ｂ スター接続二次巻線
１Ｃ デルタ接続二次巻線
２ 第１三相全波整流回路
３ 第２三相全波整流回路
４ 第１直流リアクトル
５ 第２直流リアクトル
６ 第１平滑コンデンサ
７ 第２平滑コンデンサ
８ 第１インバータ回路
９ 第２インバータ回路
１２ 第１インバータ装置
１３ 第２インバータ装置
１５ 三相交流電源
１６ 正極側接続線
１７ 負極側接続線
２０，３０ １２パルス電力変換装置
２１ バランス用２巻線リアクトル
２２ 平滑コンデンサ
２３ インバータ回路
３１ バランス用直流リアクトル
３２ 並列接続線
４１ 電源側接続線[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a 12-pulse power converter that balances the outputs of two power converters that separately perform full-wave rectification on two sets of three-phase AC power supplies having a phase difference of 30 degrees.
[0002]
[Prior art]
FIG. 3 is a main circuit connection diagram showing a first conventional example of a 12-pulse power converter. In the first conventional circuit shown in FIG. 3, a 12-pulse connection transformer 1 is connected to a three-phase AC power supply 15. This 12-pulse connection transformer 1 is composed of a primary winding 1A and two sets of secondary windings, that is, a star connection secondary winding 1B and a delta connection secondary winding 1C. If one of the windings is a star connection, the other is a delta connection.
[0003]
The first inverter device 12 is inserted into the first three-phase full-wave rectifier circuit 2 and the first inverter circuit 8 as the first power converter, and a direct current intermediate circuit connecting the direct current sides of both. The first inverter 4 is composed of a first DC reactor 4 and a first smoothing capacitor 6. The first inverter device 12 is connected to the star-connected secondary winding 1B of the 12-pulse connecting transformer 1, and the first inverter The device 12 supplies AC power having a desired voltage and frequency to the first AC load 10. Similarly, the second inverter device 13 is also inserted into the second three-phase full-wave rectifier circuit 3 and the second inverter circuit 9 as the second power converter, and a DC intermediate circuit that connects the DC sides of the two. The second DC reactor 5 and the second smoothing capacitor 7 are connected to each other, and the second inverter device 13 is connected to the delta connection secondary winding 1C of the 12-pulse connection transformer 1 to provide a second AC load. 11 is supplied with AC power having a desired voltage and frequency.
[0004]
Since there is a phase difference of 30 degrees between the three-phase AC output of the star-connected secondary winding 1B and the three-phase AC output of the delta-connected secondary winding 1C, each secondary winding 1B and 1C is separately provided. By connecting the three-phase full-wave rectifier circuits 2 and 3, a so-called 12-pulse power converter is formed, and the effect of reducing the harmonic current flowing to the three-phase AC power supply 15 can be obtained. However, when the first three-phase full-wave rectifier circuit 2 and the second three-phase full-wave rectifier circuit 3 separately supply DC power to the respective loads, the outputs of both the three-phase full-wave rectifier circuits 2 and 3 are usually Since they are not the same, the above-described harmonic current reduction effect cannot be expected.
[0005]
The first DC reactor 4 and the first smoothing capacitor 6 are connected to the DC output side of the first three-phase full-wave rectifier circuit 2 to smooth the DC output. The second DC reactor 5 and the second smoothing capacitor 7 are also connected to the output side to smooth the DC output. These smoothed DC outputs are connected to the positive side connection line 16 and the negative side connection line 17. Connect in parallel. Thus, the output current of the first three-phase full-wave rectifier circuit 2 and the output current of the second three-phase full-wave rectifier circuit 3 are balanced even when power is supplied to the first AC load 10 and the second AC load 11. Is in a state.
[0006]
[Problems to be solved by the invention]
However, in practice, there is a slight imbalance between the no-load voltage of the star-connected secondary winding 1B of the 12-pulse connecting transformer 1 and the no-load voltage of the delta-connected secondary winding 1C. Since the winding inductance of each of the lines 1B and 1C does not have the same value, the DC outputs of the smoothed three-phase full-wave rectifier circuits 2 and 3 are connected in parallel by the positive side connection line 16 and the negative side connection line 17. However, the DC current of both may be unbalanced. Here, the first DC reactor 4 and the second DC reactor 5 inserted in the DC intermediate circuit of both the inverter devices 12 and 13 are configured so that both the inverter devices 12 and 13 are independent six-pulse power converters (that is, the positive electrode side). When driving (with the connection line 16 and the negative side connection line 17 removed), the input power factor is improved. Therefore, the first DC reactor 4 operates so as to keep only the output DC current of the first three-phase full-wave rectifier circuit 2 constant, and the second DC reactor 5 is the output DC of the second three-phase full-wave rectifier circuit 3. It operates so as to keep only the current constant, and it cannot be expected to operate as a balancer that balances the output DC currents of the three-phase full-wave rectifier circuits 2 and 3.
[0007]
Therefore, a special transformer with a special structure is specially made to reduce the unbalance of the no-load voltage and the unbalance of the winding inductance of the star connection secondary winding 1B and the delta connection secondary winding 1C. However, it takes a long time to increase the price. Furthermore, it is theoretically difficult to make the aforementioned unbalance completely zero.
[0008]
FIG. 4 is a main circuit connection diagram showing a second conventional example of a 12-pulse power converter, and shows a case where AC power is supplied to a single load. In the second conventional circuit shown in FIG. 4, the 12-pulse power converter 20 includes a first three-phase all-power as a first power converter connected to the star-connected secondary winding 1 </ b> B of the 12-pulse connecting transformer 1. Wave rectifier circuit 2, 12-pulse connection transformer 1 delta connection secondary winding 1C connected as a second power converter as a second three-phase full-wave rectifier circuit 3, balancing two-winding reactor 21, smoothing capacitor 22 and an inverter circuit 23, and the AC load 24 is operated with AC power having a desired voltage and frequency output from the inverter circuit 23. The balancing two-winding reactor 21 includes one coil for flowing the output DC current of the first three-phase full-wave rectifier circuit 2 and the other coil for flowing the output DC current of the second three-phase full-wave rectifier circuit 3. In addition, since these two coils are wound around a common iron core, the unbalance of the output currents of both three-phase full-wave rectifier circuits 2 and 3 can be suppressed. However, in the conventional circuit of FIG. 4, the balancing two-winding reactor 21 must be specially manufactured, so that the apparatus is also expensive and the delivery time of the apparatus is long.
[0009]
Therefore, an object of the present invention is to use the output current of the two three-phase full-wave rectifier circuits constituting the 12-pulse power converter without using a 12-pulse connection transformer or a balancing 2-winding reactor that is specially manufactured. It is to balance easily.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a 12-pulse power converter according to the present invention provides:
Connect to the three-phase AC power supply and the DC output side of the first power converter to obtain DC by full-wave rectification, and connect to this three-phase AC power supply and another three-phase AC power supply having a phase difference of 30 degrees It is assumed that a DC output side of a second power converter that obtains DC by wave rectification is connected in parallel, and a DC reactor and a smoothing capacitor are inserted between the parallel connection point and a load.
[0011]
Alternatively, the first DC reactor and the first smoothing capacitor are connected to the DC output side of the first power converter, the second DC reactor and the second smoothing capacitor are connected to the DC output side of the second power converter, The power supply side of the first DC reactor and the power supply side of the second DC reactor are connected in common, and the load is connected after the first smoothing capacitor and the second smoothing capacitor are connected in parallel.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a main circuit connection diagram showing a first embodiment of the present invention. A 12-pulse connection transformer 1 (a primary winding 1A and a star connection secondary winding 1B described in the circuit of the first embodiment. And a delta-connected secondary winding 1C), a first three-phase full-wave rectifier circuit 2 as a first power converter, a second three-phase full-wave rectifier circuit 3 as a second power converter 3, and a three-phase AC power source 15, the names, uses, and functions of the smoothing capacitor 22, the inverter circuit 23, and the AC load 24 are the same as those of the second conventional circuit described above with reference to FIG.
[0013]
The 12-pulse power converter 30 in the first embodiment circuit of FIG. 1 is connected to the DC output side of the first three-phase full-wave rectifier circuit 2 connected to the star-connected secondary winding 1B and the delta-connected secondary winding 1C. The DC output side of the second three-phase full-wave rectifier circuit 3 is connected in parallel by two parallel connection lines 32, and the smoothing capacitor 22 and the balance are connected between the parallel connection point and the DC side of the inverter circuit 23. It has the structure where the direct current reactor 31 for insertion was inserted. By connecting the DC output sides of both three-phase full-wave rectifier circuits 2 and 3 in parallel by two parallel connection lines 32, the balancing DC reactor 31 is connected to the output DC current of the first three-phase full-wave rectifier circuit 2 and 2. Operates so as to keep the output DC current of the three-phase full-wave rectifier circuit 3 constant. In other words, the current balance action similar to that of the above-described balancing two-winding reactor 21 can be obtained in the conventional circuit of FIG.
[0014]
FIG. 2 is a main circuit connection diagram showing a second embodiment of the present invention. This second embodiment circuit is obtained by adding a power supply side connection line 41 to the first conventional circuit described in FIG. However, the names, applications, and functions of the other devices are the same as those of the first conventional circuit shown in FIG.
[0015]
In the circuit of the second embodiment, in order to make the DC output side of the first three-phase full-wave rectifier circuit 2 and the DC output side of the second three-phase full-wave rectifier circuit 3 common, both are connected to the power supply side connection line 41. Connect with. Accordingly, the first DC reactor 4 and the second DC reactor 5 operate so as to keep the DC current output from the three-phase full-wave rectifier circuits 2 and 3 constant. The same effect as the reactor 21 is exhibited.
[0016]
If the circuit configuration shown in the circuit of the second embodiment of FIG. 2 is used, the first three-phase full-wave rectifier circuit 2 and the second three-phase full-wave rectifier circuit 3 are operated in parallel, thereby causing an unbalance. DC power can be supplied to the load common to both of them, and if the positive side connecting line 16, the negative side connecting line 17 and the power source side connecting line 41 are removed, the first three-phase full-wave rectifier circuit 2 and the first It is also possible to operate the two-phase full-wave rectifier circuit 3 separately and supply power to different loads.
[0017]
FIG. 5 is a current waveform diagram depicting the output current of the 12-pulse connection transformer illustrated in the first conventional circuit of FIG. 3 by simulation calculation. The 12-pulse connection transformer in the first conventional circuit of FIG. There is a difference of 3 volts between the no-load voltage appearing in the star connected secondary winding 1B and the no-load voltage appearing in the delta connected secondary winding 1C, and the inductance of both the secondary windings is 10%. The calculation is performed under the condition of simulation. In this current waveform diagram, the vertical axis represents current, the horizontal axis represents time, the broken line represents the output current I B of the star connection secondary winding 1B, and the solid line represents the output current I C of the delta connection secondary winding 1C. Each shows.
[0018]
FIG. 6 is a current waveform diagram in which the output current of the 12-pulse connecting transformer shown in the circuit of the second embodiment of FIG. 2 is drawn by simulation calculation. The conditions for the simulation calculation at this time are the currents of FIG. This is the same as the waveform diagram. In the current waveform diagram of FIG. 6, the output current I B of the star-connected secondary winding 1B shown by the broken line is almost the same as the output current I C of the delta-connected secondary winding 1C shown by the solid line (both currents). The balance is 90% as an effective value), and it can be seen that the current imbalance in the conventional circuit shown in FIG. 5 is greatly improved.
[0019]
【The invention's effect】
The 12-pulse power converter has a configuration in which separate three-phase full-wave rectifiers are connected to two sets of three-phase alternating currents each having a phase difference of 30 degrees. In order to obtain a three-phase alternating current, a 12-pulse connection transformer having a star connection secondary winding and a delta connection secondary winding is used. However, in principle, it is difficult to make the no-load voltage of the two secondary windings and the impedance value of the two secondary windings provided in the 12-pulse connection transformer equal to the same value. Therefore, in the past, a 12-pulse connection transformer specially designed and manufactured to reduce this unload voltage imbalance and winding impedance imbalance, or a specially designed and manufactured balance 2 Since it was necessary to suppress the unbalanced current between the two using a winding reactor, the cost of the entire device increased, and there was a problem that it took a long time to manufacture the device.
[0020]
On the other hand, in the present invention, the DC output side of the three-phase full-wave rectifier separately connected to the two secondary windings is connected in parallel, and then the balancing DC reactor common to both three-phase full-wave rectifiers is used. And connect a smoothing capacitor. Or, in the case of two three-phase full-wave rectifiers with separate balancing DC reactors and smoothing capacitors, a connection that shares the output side of each three-phase full-wave rectifier and a connection that connects two smoothing capacitors in parallel Apply. By doing so, the current balance between the two can be obtained almost completely. In other words, only the work of connecting several connecting lines is added, and no special 12-pulse connection transformer or balance 2-winding reactor is required. Can be obtained, and the effect of suppressing the overall size of the apparatus from being increased can also be obtained.
[Brief description of the drawings]
FIG. 1 is a main circuit connection diagram illustrating a first embodiment of the present invention. FIG. 2 is a main circuit connection diagram illustrating a second embodiment of the present invention. FIG. 4 is a main circuit connection diagram showing a second conventional example of a 12-pulse power converter. FIG. 5 is a circuit diagram of a 12-pulse connection transformer shown in the first conventional circuit of FIG. FIG. 6 is a current waveform diagram showing the output current of the 12-pulse connecting transformer shown in the circuit of the second embodiment of FIG. 2 by simulation calculation.
1 12 Pulse connection transformer 1A Primary winding 1B Star connection secondary winding 1C Delta connection secondary winding 2 First three-phase full-wave rectifier circuit 3 Second three-phase full-wave rectifier circuit 4 First DC reactor 5 First 2 DC reactor 6 1st smoothing capacitor 7 2nd smoothing capacitor 8 1st inverter circuit 9 2nd inverter circuit 12 1st inverter apparatus 13 2nd inverter apparatus 15 Three-phase alternating current power supply 16 Positive electrode side connection line 17 Negative electrode side connection line 20, 30 12-pulse power converter 21 Balance 2-winding reactor 22 Smoothing capacitor 23 Inverter circuit 31 Balancing DC reactor 32 Parallel connection line 41 Power supply side connection line

Claims (2)

第１三相交流電源に接続して全波整流により直流を得る第１電力変換装置の直流出力側と、前記第１三相交流電源と３０度の位相差を有する第２三相交流電源に接続して全波整流により直流を得る第２電力変換装置の直流出力側とを並列に接続し、この並列接続点と負荷との間に、前記第１電力変換装置の出力電流と前記第２電力変換装置の出力電流とを平衡させるバランス用直流リアクトルと平滑コンデンサを挿入することを特徴とする１２パルス電力変換装置。Connected to the first three-phase AC power source to obtain a direct current by full-wave rectification, the DC output side of the first power converter, and the second three-phase AC power source having a phase difference of 30 degrees from the first three-phase AC power source A DC output side of a second power converter that is connected to obtain DC by full-wave rectification is connected in parallel, and the output current of the first power converter and the second are connected between the parallel connection point and a load . A 12-pulse power converter characterized by inserting a balancing DC reactor and a smoothing capacitor for balancing the output current of the power converter. 第１三相交流電源に接続して全波整流により直流を得る第１電力変換装置の直流出力側に第１直流リアクトルと第１平滑コンデンサを接続し、前記第１三相交流電源と３０度の位相差を有する第２三相交流電源に接続して全波整流により直流を得る第２電力変換装置の直流出力側に第２直流リアクトルと第２平滑コンデンサを接続し、前記第１直流リアクトルの電源側と第２直流リアクトルの電源側とを共通に接続し、前記第１平滑コンデンサと第２平滑コンデンサとを並列に接続することを特徴とする１２パルス電力変換装置。A first DC reactor and a first smoothing capacitor are connected to the DC output side of the first power converter that is connected to the first three-phase AC power source to obtain DC by full-wave rectification, and 30 degrees from the first three-phase AC power source. A second DC reactor and a second smoothing capacitor are connected to a DC output side of a second power converter that is connected to a second three-phase AC power source having a phase difference of A 12-pulse power converter characterized in that the power source side of the second DC reactor and the power source side of the second DC reactor are connected in common, and the first smoothing capacitor and the second smoothing capacitor are connected in parallel.
JP03382799A 1999-02-12 1999-02-12 12 pulse power converter Expired - Fee Related JP3769963B2 (en)

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